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Preparation method of nano chitin/polyvinyl alcohol composite film, nano chitin/polyvinyl alcohol composite film prepared by means of preparation method and application of nano chitin/polyvinyl alcohol composite film

A nano-chitin and polyvinyl alcohol technology, which is applied in transportation and packaging, sustainable manufacturing/processing, flexible and slender elements, etc., can solve the problems of unapplicable packaging materials, poor water resistance of composite films, and complicated preparation process and other problems, to achieve the effect of improving various performances, antibacterial and non-toxic, and simple drying equipment

Inactive Publication Date: 2019-01-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN103342825A discloses a preparation method of chitin nanofiber / polyvinyl alcohol composite film, but the composite film prepared by this patent has poor water resistance and cannot be used in the field of packaging materials
[0005] At present, the preparation process of most existing nano-chitin / polyvinyl alcohol composite films is complicated, consumes a lot of energy, and the prepared composite films have poor water resistance and cannot be used in the field of packaging materials.

Method used

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  • Preparation method of nano chitin/polyvinyl alcohol composite film, nano chitin/polyvinyl alcohol composite film prepared by means of preparation method and application of nano chitin/polyvinyl alcohol composite film
  • Preparation method of nano chitin/polyvinyl alcohol composite film, nano chitin/polyvinyl alcohol composite film prepared by means of preparation method and application of nano chitin/polyvinyl alcohol composite film
  • Preparation method of nano chitin/polyvinyl alcohol composite film, nano chitin/polyvinyl alcohol composite film prepared by means of preparation method and application of nano chitin/polyvinyl alcohol composite film

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preparation example Construction

[0035] According to a first aspect of the present invention, a kind of preparation method of nano-chitin / polyvinyl alcohol composite film is provided, comprising the following steps:

[0036] Put the nano-chitin film into the polyvinyl alcohol solution, take it out and dry and heat-treat to obtain the nano-chitin / polyvinyl alcohol composite film;

[0037] The nano-chitin film is obtained after coating and solidifying the nano-chitin suspension;

[0038] Heat treatment is heating to 110-120°C in a saturated water vapor environment.

[0039] The " / " in the nano-chitin / polyvinyl alcohol composite film means and.

[0040] A saturated water vapor environment refers to an environment in which the temperature of the steam is the same as that of the water that generates the steam; a preferred embodiment of heat treatment is heating to 110-120° C. in a high-temperature sterilizer.

[0041] Typical but non-limiting examples of heat treatment temperature are 110°C, 111°C, 112°C, 113°C,...

Embodiment 1

[0114] A preparation method of nano-chitin suspension, comprising the following steps:

[0115] (1) Soak 20 g of discarded shrimp shells in 1mol / L sodium hydroxide solution to remove residual protein, then wash with deionized water until neutral to obtain deproteinized shrimp shells;

[0116] (2) Soak deproteinized shrimp shells in 1mol / L hydrochloric acid to remove minerals, then wash with deionized water until neutral to obtain demineralized shrimp shells;

[0117] (3) Soak demineralized shrimp shells in 0.1mol / L sodium chlorite solution and bleach for 2 hours, and dry the shrimp shells after bleaching;

[0118] (4) Soak the dried shrimp shells in 44wt% sodium hydroxide solution, add 5g sodium borohydride at the same time, and carry out deacetylation reaction under magnetic stirring for 3 hours in an oil bath at 90°C. After the reaction is completed, add acetic acid to adjust the pH of the solution To 3.5, obtain chitin suspension;

[0119] (5) The prepared chitin suspensi...

Embodiment 2

[0121] (1) The nano-chitin suspension prepared in Example 1 was added into ultrapure water to prepare a concentration of 0.1 wt%, fully stirred evenly at room temperature, and then ultrasonicated for 30 minutes;

[0122] (2) cast the obtained nano-chitin suspension to a smooth polytetrafluoroethylene mold with a diameter of 6 cm, let it stand for 12 hours to remove air bubbles, transfer it to a constant temperature and humidity chamber at a temperature of 50° C., and dry it for 10 hours to obtain a nano-chitin film;

[0123] (3) Dip the prepared nano-chitin film into a 10Wt% polyvinyl alcohol solution, and place it at room temperature for 15h;

[0124] (4) Suspend the obtained nano-chitin film immersed in polyvinyl alcohol solution for 30 minutes, to drain away the non-immersed polyvinyl alcohol solution on the surface to obtain a nano-chitin / polyvinyl alcohol wet film;

[0125] (5) Transfer the nano-chitin / polyvinyl alcohol wet film to a constant temperature and humidity box ...

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Abstract

The invention discloses a preparation method of nano chitin / polyvinyl alcohol composite film, nano chitin / polyvinyl alcohol composite film prepared by means of the preparation method and application of the nano chitin / polyvinyl alcohol composite film, and relates to the field of packing materials. The preparation method of the nano chitin / polyvinyl alcohol composite film comprises the steps of adding nano chitin film into polyvinyl alcohol solution, taking out, drying, and thermally treating to obtain nano chitin / polyvinyl alcohol composite film, wherein the nano chitin film is made by subjecting nano chitin suspension to film laying and curing; thermal treatment refers to heating to 110-120 DEG C in a saturated steam environment. The preparation method has the advantages of good process simplicity, wide source range of materials, low preparation cost, environmental friendliness and the like, allows marine industry wastes to be efficiently utilized, and helps improve their utilizationvalue. The nano chitin / polyvinyl alcohol composite film prepared by means of the preparation method has the advantages of good barrier property, biodegradability, transparency, tensile strength, thermal stability, baceriostasis, zero toxicity and the like, and is suitable for serving as an antibacterial environment-friendly packing material.

Description

technical field [0001] The invention relates to the field of packaging materials, in particular to a method for preparing a nano-chitin / polyvinyl alcohol composite film, the prepared composite film and its application. Background technique [0002] With the continuous development of industry, "white pollution" is becoming more and more serious. In this environment, degradable and environmentally friendly packaging materials are favored. A biodegradable material is a material that can be decomposed by natural microorganisms under certain time and conditions, and the final products of its degradation are carbon dioxide, water and some small molecular substances that are harmless to the environment. [0003] Miniaturization is an ongoing trend in the field of materials science. Nanofibers have been successfully prepared from different synthetic or natural polymers by reducing the size of the material structure to enhance the original properties. The so-called nanofiber refers ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J7/12C08B37/08B65D65/42C08L5/08C08L29/04
CPCB65D65/42B65D2565/381C08B37/0003C08J5/18C08J7/12C08J2305/08C08J2429/04Y02W90/10
Inventor 陈广学彭超田君飞万小芳陈奇峰
Owner SOUTH CHINA UNIV OF TECH
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